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in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
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“The Right to Information, The Right to Live”
“Step Out From the Old to the New”
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Jawaharlal Nehru
IS 3111 (1984): Silver thread [MTD 10: Precious Metals]
“!ान $ एक न' भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
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है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
( Reaffirmed 2001 )
IS:3111-1984
Indian Standard
SPECIFICATION FOR
SILVER THREAD
(
First Revision )
Precious Metals Sectional Committee,
Chairman
SMDC 13
Representing
SHRI A. W. CHAWATHE
Ministry of Finance, New Delhi
Members
Bharat Gold Mines Ltd, Colar Gold Fields
SHRI B. G. K. BALIQA
SHRI D. K. BANDYOPADRYAY
Hindustan Copper Ltd, Calcutta
Indian Telephone Industries Ltd, Bangalore
SHRI J. NA~ESH BH.WT
SHRI A. D WARAKANATR ( Alternate )
Bharat Bullion
SHRI RAMANLAL P. CHOKSI
Co-op
Refinery
Society
Ltd,
Ahmadabad
SHRI CHINUBHAI D. SHETH ( Alternate )
Choksi Contacts Pvt Ltd, Udaipur
SHRI RAVINDRA S. C~IOKSI
SHRI PRAKASH S. CHOKSI ( Alternate )
SHRI SRASHIKANT S. CHOKSI
Hindustan Platinum Pvt Ltd, Bombay
SRRI CHANDRAKANT S. CHOKSI ( Alternate )
Government Dental College and Hospital, Bombay
DR V. M. DESAI
National Test House, Calcutta
SRRI M. P. DUBEY
Bhabha Atomic Research Centre, Bombay
DR C. S. P. IYER
DR T. P. RADRAKRISHNAN ( Alterttate )
Gujarat Bullion Refinery, Ahmadabad
SRRI J. N. KAN~ARA
SXRI B. S. KANSARA ( Alternate )
A11 India Sarafa Association, Delhi
SHRI DHARAMVEER KAPOOR
SHRI PREM NATH KHANNA ( Alternate )
The Hutti Gold Mines Co Ltd, Hutti
SHRI S. C. MARANTI
SHRI J. S. GURURAJ NAIK ( Alternate )
Consumer Guidance Society of India, Bombay
SHRIMATI PUSHPA MOTWANI
SHRIMAT~ SHARDA JOSHI ( Alternate )
Export Inspection Council of India, New Delhi
SHRI R. C. PALHAN
SHRI J. P. MAIXHARI ( Alternate )
Regional Office of the Gold Control Administrator,
SHRI N. GOPALAN
Bombay
S-RI M. P. REGE ( Alternate )
SHRI K. S. RAWCZARAJAN
Directorate General of Technical
Developme nt,
New Delhi
SHRI M. K. BANERJEE ( Alternate )
( Cuntinued on page 2 )
Q Copvright 1984
INDIAN
STANDARDS
INSTITUTION
This publication
is protected under the Indian Copyright Act ( XIV of 1957 ) and
reproduction in whole or in part by any means except with written permiwion of the
publisher shall be deemed to be an infringement of copyright under the said Act. I
IS : 3111 - 1984
( Continued from page 1 )
Members
Represenling
REPRESENTATIVE
All India Handicrafts Board, New Delhi
SHRIP.K.SEN
Ministry of Defence ( DGI )
SHRIC.K.SHAH
National Refinery Pvt Ltd, Bombay
SHRIS. P.SONAWALA
(Alternate)
SERI AMRITLALG.SONAWALLA
The Bombay Bullion Association Ltd, Bombay
Sanr SHANTILAL NARANDAS
( Alternate)
SHRIV.VANDAGOPAL
Tamil Nadu ,Jeweller’s Federation,
Madras
SHRI NaTWAR T. ZAVERI
The Gem & Jewellery
Export Promotion
Council,
Bombay
SHRI NIRMAL KUMAR RAIXYAN (Alternate)
SBRIK.RAQHAVENDRAN,
Director General, ISI ( Ex-ojicio
Member)
Director ( Strut & Met )
Secretary
SHRI A. B. TEWARI
Deputy Director ( Metals ), IS1
Adhoc
Panel
for Jari,
SMDC
13 : 2/AP
Convener
SHRIA.W.CHAWATHE
Ministry of Fi&nce
Members
SHRIHAR
MOHANLSL
DR C. S. P. IYER
SHRI R.T.POPAWALA
REPRESENTtlTIVE
SECRETARY
SHRIC.K.SHAH
SHRI P.K.SRIVaST-\V+
SHRIC.P.S.SANGAR(
Ganeshilal & Sons, Agra
Bhabha Atomic Research Centre, Bombay
All India Federation of Jari Industries, Surat
All India Handicrafts Board, New Delhi
Surat Jari Merchants Association, Surat
National Refinery Pvt Ltd, Bombay
Quality Marking Scheme, Director
of Industries,
Government of Uttar Pradesh, Kanpur
Alternate )
2
IS : 3111- 1984
Indian Standard
SPECIFICATION FOR
SILVER THREAD
( First Revision )
L
0.
0.1 This
Standards
precious
Structural
FOREWORD
Indian Standard
( First Revision ) was adopted by the Indian
Institution
on 31 May 1984, after the draft finalized by the
Metals
Sectional
Committee
had been
approved
by the
and Metals Division Council.
0.2 This standard
was earlier published
in 1965.
Reference
has been
made in this revision
to a comprehensive
standard
on methods
of
chemical
analysis of silver thread.
Other references have also been updated.
0.3 For the purpose of deciding
whether a particular
requirement
of
this standard is complied with, the final value, observed
or calculated,
expressing
the resuh of a test or anaIysis, shaII be rounded off in accorThe number of significant
places retained in
dance with IS : 2-1960*.
the rounded off value should be the same as that of the specified value in
this standard.
1. SCOPE
1.1 This standard
the quality
prescribes the requirements
of the base yarn to be used.
for pure silver thread
and
2. TERMINOLOGY
2.0 For the purpose
of this
standard,
the
following
definitions
shall
apply.
2.1 Marts - Bundle of skeins ( hAhis ) or spools containing
jcari thread
weighing net mass between 200 and 300 g is termed as ‘marts’,
*Rules
for rounding
off numerical
values ( revised ).
3
IS:3111-1984
3. COMPOSITION
3.1 The
minimum
silver
content
of the silver thread
shall be 50 percent
by mass.
3.2 Purity of Silver - Silver used for the manufacture
of silver thread
shall be of minimum
91.6 percent
by mass
minimum
purity
( see
IS : 2112-1981*
).
4. BASE YARNS
4.1 Nature of Base Yarn and Its Composition
4.1.1 RealedSilk
4.1.2
Yarn -
16, 18, 20 or 22 denier.
Cotton Yarn
SOS/2
100 x 2 dtex
805/2
74 x 2 dtex
100512
59 x 2 dtex
120”/2
49 x 2 dtex
70813
84 x 3 dtex
80813
74 x 3 dtex
9osj3
66 x 3 dtex
4.1.3
Viscose Rayon Yarn -
4.1.4
Nylon Yarn -
55, 75 or 100 denier.
15 denier.
4.2 Coiour Fastness of the
between the supplier and the
base yarn shall be not less
accordance
with the relevant
Table 1.
Base Yarn - Unless otherwise agreed
purchaser,
the colour fastness rating of
than that given in Table 1 when tested
Indian
Standard
method
referred
to
to
the
in
in
5. PACKING
5.1 Silver thread
shall be packed in packets designate as ‘marts
each of
net mass ( without spool ) in between 200 and 300 g and each containing
8 or 16 skeins ( Zachhis ) or Y spools.
6. SAMPLING
AND
CRITERIA
FOR CONFORMITY
6.1 Lot factured
together
In any consignment,
all the packets
of silver thread manuat a time and from a single type of base yarn, shall be grouped
to constitute a lot.
*Grades of silver and silver alloys ( jrst
revision ).
Is : 3111-1984
TABLE
1 FASTNESS
TO LIGHT
AND
WASHING
( Clauses 4.2 and 7.1 )
CHARACTERISTIC
FASTNESS RATEW No.
(1)
METHOD OF TEST
(2)
(3)
Colour fastness to light
4 or better
IS
IS
Colour fastness to washing
4 or better
IS : 687-1979$
*Method for determination
tMethod for determination
( xenon lamp ).
$Method for determination
( Jecondreuision).
: 686-1957* or
: 2454-1967t
of colour fastness of textile materials to daylight.
of colour fastness of textile materials to artificial
of colour fastness of textile materials to washing:
light
Test 1
6.2 In order to determine the conformity of the lot to the requirements
of the specification, sample shall be selected at random in accordance
with Table 2, for random selection procedures, reference may be made
to IS : 4905-1968*.
TABLE
2
SCALE
OF SAMPLING
LOT SIZE
( NVMBER ox PACKETS )
SAMPLE SIZE
( NUMBER OF PACKETS )
(1)
(2)
up to 10
2
11 to 25
3
26 to 50
4
5
51 and above
6.3 Each packet selected in accordance with Table 2, shall be examined
If the samples are
for the material,
its weight and mode of packing.
found satisfactory, further tests shall be conducted for chemical analysis.
6.4 For every 50 packets or part thereof,
chemical analysis and one test shall be
of base yarn. The lot shall be considered
ofthis specification, if there is no failure,
one test shall be conducted for
carried out for the requirements
conforming to the requirements
in respect of these tests.
6.5 A minimum of 10 m of juri in the running length from one skein
( /a&hi ) in the lot shall be checked for the nature of the base yarn, its
count and fastness of its colour.
*Methods for random sampling.
IS : 3111 - 1984
6.6 The entire lot shall be rejected if the sample representing the lot fails
to meet the requirements specified in this standard.
7. TESTS
7.1 Silver content of the silver thread shall be determined in accordance
with the method given in IS : 9925-1981* and other tests carried out as
specified in Table 1.
8. MARKING
8.1 Each ‘mart’ shall be marked legibly with the percentage of silver,
length in metres per mass in grams, nature of the base yarn and its count,
name of the manufacturer or his recognized trade-mark, and the place
of production.
8.1.1
Mark.
The material may also be marked
with the IS1 Certification
NOTR- The ure of the IS1 Certification Mark is governed by the provisions of the
Indian Standards Institution ( Certification
Marks ) Act and the Rules and Regulations made thereunder.
The IS1 Mark on products covered by an Indian Standard
conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality
control which is devised and supervised by IS1 and operated by the producer.
IS1
marked products are also continuously checked by ISI for conformity to that
standard as a further safeguard.
Details of conditions under which a licence for the
use of the IS1 Certification Mark may be granted to manufacturers or processors,
may be ohtained from the Indian Standards Institution.
*Method
materials.
for determination
of
gold and
6
silver
in gold
thread
and embreidery